Low frictional strength of quartz rocks at subseismic slip rates

Details Low frictional strength of quartz rocks at subseismic slip rates Low frictional strength of quartz rocks at subseismic slip rates

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29q..25g&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 17, pp. 25-1, CiteID 1844, DOI 10.1029/2002GL015240

Physics

34

Seismology: Earthquake Dynamics And Mechanics, Seismology: Earthquake Ground Motions And Engineering, Structural Geology: Fractures And Faults, Mineral Physics: Creep And Deformation

Scientific paper

Laboratory experiments on rocks at low sliding velocity typically yield values of the friction coefficient of 0.6-0.85. Here we demonstrate that an extraordinary decrease in friction coefficient accompanies sliding of `room dry' quartz rocks at rates faster than in most laboratory experiments, but slower than seismic slip rates. In some cases, the friction coefficient decreases from low-speed values by more than a factor of 3. This extraordinary weakening likely results from the formation of finely comminuted, amorphous, wet material on the sliding surface.

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